/Engine/Source/Runtime/Core/Public/Containers/SortedMap.h
Sets a default value associated with a key.
A reference to the value as stored in the map. The reference is only valid until the next change to any key in the map.
[ValueType](API\Runtime\Core\Containers\TSortedMap\ValueType) & Add ( const [KeyType](API\Runtime\Core\Containers\TSortedMap\KeyType) & InKey )